protected override void GetCenterTile(int tileCountOnX, int tileCountOnY, out int tileX, out int tileY, out float offsetX, out float offsetZ)
{
int[] tileCoordinates = GeoHelpers.WGS84ToTile(Map.CenterWGS84[0], Map.CenterWGS84[1], Map.RoundedZoom);
double[] centerTile = GeoHelpers.TileToWGS84(tileCoordinates[0], tileCoordinates[1], Map.RoundedZoom);
double[] centerTileMeters = Map.WGS84ToEPSG900913Transform.Transform(centerTile); //GeoHelpers.WGS84ToMeters(centerTile[0], centerTile[1]);
tileX = tileCoordinates[0];
tileY = tileCoordinates[1];
offsetX = Map.RoundedHalfMapScale / 2.0f - (float)(Map.CenterEPSG900913[0] - centerTileMeters[0]) * Map.RoundedScaleMultiplier;
offsetZ = -Map.RoundedHalfMapScale / 2.0f - (float)(Map.CenterEPSG900913[1] - centerTileMeters[1]) * Map.RoundedScaleMultiplier;
}
protected override string GetTileURL(int tileX, int tileY, int roundedZoom)
{
double[] tile = GeoHelpers.TileToWGS84(tileX, tileY, roundedZoom);
double[] tileMeters = Map.WGS84ToEPSG900913Transform.Transform(tile); //GeoHelpers.WGS84ToMeters(tile[0], tile[1]);
float tileSize = Map.TileResolution * Map.RoundedMetersPerPixel;
double[] min = Map.EPSG900913ToWGS84Transform.Transform(new double[2] {
tileMeters[0], tileMeters[1] - tileSize
}); //GeoHelpers.MetersToWGS84(xmin, ymin);
double[] max = Map.EPSG900913ToWGS84Transform.Transform(new double[2] {
tileMeters[0] + tileSize, tileMeters[1]
}); //GeoHelpers.MetersToWGS84(xmax, ymax);
return(baseURL + (baseURL.EndsWith("?") ? "" : "?") + "SERVICE=WMS&REQUEST=GetMap&VERSION=1.1.1&LAYERS=" + layers + "&STYLES=&SRS=" + srsName + "&BBOX=" + min[0] + "," + min[1] + "," + max[0] + "," + max[1] + "&WIDTH=" + Map.TileResolution + "&HEIGHT=" + Map.TileResolution + "&FORMAT=" + format);
}
private void UpdateInternals()
{
// FIXME: the half map scale is a value used throughout the implementation to rule the camera elevation
// and the size/scale of the tiles, it depends on fixed tile size and resolution (here 256 and 72) so I am not
// sure it would work for a tile layer with different values...
// maybe there is a way to take the values out of the calculations and reintroduce them on Layer level...
// FIXME: the 'division by 20000' helps the values to be kept in range for the Unity3D engine, not sure
// this is the right approach either, feels kinda voodooish...
halfMapScale = GeoHelpers.OsmZoomLevelToMapScale(currentZoom, /*(float)centerWGS84[1]*/ 0.0f, tileResolution, 72) / scaleDivider;
roundedHalfMapScale = GeoHelpers.OsmZoomLevelToMapScale(roundedZoom, (float)/*(float)centerWGS84[1]*/ 0.0f, tileResolution, 72) / scaleDivider;
metersPerPixel = GeoHelpers.MetersPerPixel(0.0f, (float)currentZoom);
roundedMetersPerPixel = GeoHelpers.MetersPerPixel(0.0f, (float)roundedZoom);
// FIXME: another voodoish value to help converting meters (EPSG 900913) to Unity3D world coordinates
scaleMultiplier = halfMapScale / (metersPerPixel * tileResolution);
roundedScaleMultiplier = roundedHalfMapScale / (roundedMetersPerPixel * tileResolution);
}
// <summary>
// Zooms the map.
// </summary>
public void Zoom(float zoomSpeed)
{
// apply the zoom
CurrentZoom += 4.0f * zoomSpeed * Time.deltaTime;
// move the camera
// FIXME: the camera jumps on the first zoom when tilted, 'cause cam altitude and zoom value are unsynced by the rotation
Transform cameraTransform = currentCamera.transform;
float y = GeoHelpers.OsmZoomLevelToMapScale(currentZoom, 0.0f, tileResolution, 72) / scaleDivider * screenScale;
float t = y / cameraTransform.forward.y;
cameraTransform.position = new Vector3(
t * cameraTransform.forward.x,
y,
t * cameraTransform.forward.z);
// set the update flag to tell the behaviour the user is manipulating the map
hasMoved = true;
IsDirty = true;
}